Mississippian, Pennsylvanian, and Permian rocks exposed in the Lemhi and Lost River ranges of east-central Idaho comprise a conformable succession of limestone and sandstone units. These strata have been correlated by earlier workers with the Mississippian Brazer Limestone of northern Utah and have been referred to by that name. Since the east-central Idaho section bears little lithologic or temporal similarity to the Brazer, the name should be abandoned in that area and new names applied to units of proved mappability.

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